This makes the crack stand out better on dark textures,
like obsidian and black wool.

use Zeg9`s texture

* Move furnace related code into furnace.lua
* Move duplicated code into functions
* Rewrite ABM:
	* Easier to follow strcuture (no returns in the middle)
	* No unnecessary calls to get_craft_result
	* Split logic and "visual feedback" (a bit)
	* Fewer calls to meta:set and meta:get
	* Better feedback on the current state of the furnace

This reverts commit 79856c91.

Original author: @MT-Modder

Signed-off-by: Craig Robbins <kde.psych@gmail.com>

This reverts commit dcce6e97.

Boats mod improve y motion. Smaller collision box. Reverse turn with negative velocity only. Smooth turning. Enable underwater higher acceleration